Pipe, pipe lining, and method of making same



PIPE, PIPE LINING AND METHOD OF MAKING SAME,

Jan. 12, 1943. w. s. ROBINSON Filed June 10,1939

ATTORNEYS Patented. Jan. 12,. 1943 I UNITED STATES PATENT mm:

rirarrrn Mn'rnon or I Walton S. Robinson, Montclair, N; 1., asslgnor to Robinson Engineering Corporation, Garwood, N. J a corporation of New Jersey Application June 10, 1939,] Serial No. 278,452

2 Claims. (01. 29-162) This invention relates to improvements in pipes and the like for containing or transmitting liquids which have a corrosive efiect u'pon materials such as are usually employed in the constructi'on of such devices.

Broad objects of the invention are to provide a novel method of making a lined pipe or the like for the purpose stated from steel or other suit-.

able lowcost material as well as providing a-new article of the character indicated.

Other objects are to provide a lined pipe or similar'article which can bernanufactured at a relatively low cost; which will have ametallic lining free at all points from attack by corrosive substances even at elevated temperatures; which permits shipment of standard lined lengths which can be assembled in the field with a minimumof joints; and which will have all surfaces at the joints fully protected from corrosion.

The invention consists in a novel -method of combining materials and in a new article, both of which are hereinafter explained with refer.-

ences' to the drawing accompanying and forming is of a chrome steel preferably one having a 12 to 18 percent chromium content, and other elements within the usual ranges, tubes it of that material preferably being made from a flat sheet or strip curled up into tubular form and the abutting longitudinaledges then welded to-' gether. While this means a long welded seam, experience indicates that it the best way to produce thin walled tubes having a uniform wall thickness, with the added advantage that tubes may be produced in any desired lengths so as to afford a continuous lining for a long outer shell made up as above described.

'While chrome steel of the analysis mentioned is suitable for the purpose, other alloys having thesame. characteristics may obviously be employed. Y

On each end of one of the sections H of chrome steel is welded a collar or short tubular section l3 ofa difierent corrosion resisting m'a--.

I welds, it will not disa'dvantageously ailect the which is not affected or changed by temperature within the range usual in welding. The chrome steel is non-corrosive but is affected byv the tem- I austenitic chrome nickel steel might be usedthroughout.

The outer shell [0 is preferably made of tubulai' sections of pipe which are welded together l8-8-Cb sections nor will the latter sections be affected when. two of the collars or short sections l3 are welded together in assembling a run of pipe as hereinafter described.

After a section of the lining has been assembled by welding the l8-8-Cb sections l3 on the ends of chrome steel sections-i2, the assemblage is treated at atemperature of about 1450" 'F.

This will restore tothe chrome steel portions 12 the original ductility and corrosion resistingproperties. In assembling ready, for shipment, a length of the outer shell constructed as above described may beworked upon internally to -re-' move any burrs or irregularities from the welds and the assembled and heat-treated liner then end to end, the number of sections so employed depending upon the length desired. After preparing the outer lengths,- each of them is-llned by inserting a thinwalledtube of the-non-corinserted and, if necessary, expanded into a close fit. Illhe lengths of the sections, of lining are such that thel-8-8-Cb ends will be within and terminate' substantially in alignment with the" ends of the sections of the outer shell. The

lined sections may thenbe assembled in the held by welding together end to end the lengths of outer shell I! and lining ll so'as to make long lined pipes having a minimum of Joints, in fact it is possible in this way to install iointless pipes of great lengths with continuous and eflicient non-corrosion linings throughout. Preferably the welding in the field is done by fusing together the abutting faces of the 18-8-Cb ends of the liner as at I4 and then the ends of the outer shell as indicated at l5, but this welding may, of course, be done in any of the usual ways. For making the welds l4 and I5 it is preferred to use a weld'rod containing 25% chromium and nickel, as that alloy seems best to prevent embrittlement both in the deposited weld metal and in the pipe I! and lining ll.

Where it is desired to make a joint in the pipe one end of any section of the outer wall may be flanged as shown at ii to provide a means, including the'bolt holes I], whereby the ends of sections may be bolted together. It is preferred to weld on as at I8 a flanged portion I 9 instead of trying to form such a flange by expanding or otherwise deforming the end of the shell Ill. These flanged members may be welded on in the shop or in the field as desired. If the latter is to be the practice, the end collar or short section 2|! of the l8-8-Cb material should be of sufficient length to be within the weld I81, but it ispreferred to weld the flange member I9 in place before the lining tube is inserted. The form of flange shown in the drawing is one commonly used with what are known as ring gaskets. Such gaskets seat in grooves 2| in the faces 22 of the flanges and are compressed in the grooves and between the faces when 'the sections are bolted together in installing a run of the pipe. The gaskets should, of course, be of a non-corrosive material.

One difficulty with such pipe joints has arisen from corrosion of the faces of the flanges and some complicated and expensive expedientsfor protecting these faces have become known. In

the present invention this effect is produced in a simple and economical manner which is at the same time more efficient than any prior thing known to the applicant. This is accomphshed by welding on as at 23 to the piece 20 of l8-8-Cb material of the liner a formed section 24 of the same material which extends across the radial face of the flange and is formed as at 25 to conform to the configuration of the'gasket groove. In some instances, where the liner is inserted from the flanged end of a pipe the pieces 20 and tion and some form of gaskets other than ring gaskets used to make the -seal.- That is to say,

the radial portions of the l8-8-Cb member 24.

will be under such gaskets and therefore function in the same way as described in connection with the ring gaskets.

The order of the steps in making the lined pipe herein described may be varied, the important thing being to have the collars or short sections of l8-8-Cb metal or metal having similar characteristics abutting at or coming under points where welds such as the one shown at l8 er the ones shown at I4 and I5 are to be made. In this way the corrosion resisting properties of the lining will not be affected when installations are made in the field. This makes it possible to end weld together in the field a number of sections to produce long runs of protectively lined pipe without damage to the lining and thereby reducing very materially the number of bolted together joints and the troubles arising from them. The method of constructing the sections to make this end-to-end welding possible has been explained in detail, and particularly the heat treating to restore the-straight chrome steel has been pointed out. This heating could not, of course, be accomplished as a practical matter in the field.

The protectors 24 for the flanges may be assembled on the linings before insertion in a length of pipe, but if the work is done in the field the collar 20 of l8-8-Cb material provides a. means for attaching the shield 24 of that material without leaving a portion at the weld which will be subject to attack by corrosion.

While the new articles and the method of producing them have been described above in detail, the invention may obviously be employed in other ways, and it is not the desire to be limited by that description except to the extent indicated by the claimswhich follow.

What is claimed is:

l. A section of pipe for use in constructing a line for transmitting corrosive substances, comprising a tubular outer shellof steel, and a tubular lining unit of substantially the same length as the outer shell and consisting of a short sec tion of stabilized austenitic chrome'nickel steel within each of the ends of the outer shell and straight chrome steel integral with and between said sections.

- 2. The method of making from sections a run of protectively lined pipe for transmitting corrosive substances which comprises constructing V a tubular lining section of straight chrome steel for each pipe section somewhat shorter than the within the, pipe sections, and then welding together end-to-end the stabilized austenitic chrome steel ends of liners and the ends of the enclosing sections of pipe.

WALTON S. ROBINSON. 

